#include <Arduino.h>

// put function declarations here:
int led_green = 4;
int led_yellow = 3;
int led_red = 2;

void setup()
{
  // put your setup code here, to run once:
  pinMode(led_green, OUTPUT);
  pinMode(led_yellow, OUTPUT);
  pinMode(led_red, OUTPUT);
}

void loop()
{
  // put your main code here, to run repeatedly:
  digitalWrite(led_green, HIGH);
  delay(2000);
  digitalWrite(led_green, LOW);
  digitalWrite(led_yellow, HIGH);
  delay(500);
  digitalWrite(led_yellow, LOW);
  digitalWrite(led_red, HIGH);
  delay(2000);
  digitalWrite(led_red, LOW);
}

// put function definitions here: